JP2002191203A - Hitch-lifting device of mobile vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase durability and reduce the cost of a hitch. SOLUTION: The front tops of bilateral two point links 31, 31 folded in an L-shape in the side view are linked to be rotative upward and downward to the machine body of a mobile vehicle 1, a hitch 31 is linked to the rear ends of the bilateral two point links 32, 32, the folded parts of the bilateral two point links 32, 32 are mutually connected by a connection body 35 to which fitting units 37, 37 protruding forward and having connection holes 38a, 38a are constituted and the one end of a lift cylinder 35 is connected by a pin by using an actuating pin 39 passing through the connection holes 38a, 38a in the folded parts of the bilateral two point links 32, 32 and connection holes 38b, 38b of the fitting units 37, 37. Thus, the single lift cylinder 35 and the two point links 32, 32 are brought to be strong and the strength against a horizontal torsion is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a hitch elevating device for a moving vehicle.

[0002]

2. Description of the Related Art As a prior art, there is an invention disclosed in Japanese Patent Application Laid-Open No. 4-169102. According to the present invention, the body of a mobile vehicle is provided with an L
The front ends of the left and right two-point links that are bent in the shape of a letter are vertically rotatably connected by pins, and the rear ends of the left and right two-point links are connected to a hitch, and one end of the link is connected to the fuselage. The other end of the pair of left and right lift cylinders is connected to the bending portions of the left and right two-point links, respectively, and the left and right two-point links are rotated up and down to raise and lower the hitch.

[0003]

In the prior art, a pair of left and right lift cylinders are connected to respective bending portions of left and right two-point links, and the left and right lift cylinders are expanded and contracted to extend the left and right lift cylinders. Has a disadvantage that the left and right two-point links are twisted in the horizontal direction, resulting in poor durability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to embody a left / right two-point link elevating device that improves durability while reducing costs.

[0005]

Means for Solving the Problems In order to solve such technical problems, the present invention is configured as follows. According to the present invention, front ends of left and right two-point links 32, 32, which are bent in an L-shape when viewed from the side, are connected to the body of the mobile vehicle 1 by pins so as to be vertically rotatable. Links 32, 32
Hitch 31 is connected to the rear end of the
The refracting portions 2 and 32 are connected to each other by a connecting member 36. The connecting member 36 projects forward and has connecting holes 38a and 38a.
The mounting portions 37, 37 provided with
Connecting holes 38a, 38 at the bending portions of the right two-point links 32, 32
a and the operating point pin 39 inserted into the connecting holes 38b, 38b of the mounting portions 37, 37, the lift cylinder 35
Is connected with a pin, and the other end of the lift cylinder 35 is connected with a pin to the body.

[0006]

According to the present invention, the refracting portions of the left and right two-point links 32, 32 are connected by a connecting member 36,
The connecting body 36 projects forward and has connecting holes 38a, 38a.
Are formed, and the connection holes 38a, 38a of the bending portions of the left and right two-point links 32, 32 are provided.
Also, since one end of the lift cylinder 35 is connected to one end of the lift cylinder 35 by the operating point pin 39 inserted into the connection holes 38b, 38b of the mounting portions 37, 37, the left and right two-point links 32, 32 are provided.
And the connecting portion with the single lift cylinder 35 can be made strong, and the left and right two-point links 32, 32
In addition, the strength against twisting in the horizontal direction can be increased, and the two lift links 35 can be used to raise and lower the left and right two-point links 32, thereby reducing the cost.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in which the present invention is incorporated into a hitch elevating device for connecting a working machine to a rear portion of a body of a moving vehicle 1 such as a tractor.

The moving vehicle 1 is a riding four-wheel tractor as shown in the figure, and has a pair of left and right main frames 3 and 3 disposed in the lower part of the body. The main frames 3, 3 are welded to the fuselage at the middle part in the front-rear direction, and the rear main frames 3a,
3a is configured to be wide so as to approach the inner surfaces of the left and right rear wheels 4, 4.

The main frames 3 and 3 have narrow front portions, and have an engine 5 mounted above the front portions. A front axle case 6 is mounted on the front lower portion of the main frames 3 and 3 so as to be swingable left and right around a center pivot, and left and right front wheels 8 and 8 can be steered freely at both ends of the front axle case 6 via king pins 7. The left and right front wheels 8, 8 are steered by the steering handle 9. Also, a rear axle case 11 having left and right rear axles mounted on the shaft and a traveling transmission case 12 are mounted between the left and right rear main frames 3a. Left and right rear wheels 4, 4 are attached to both ends of the left and right rear axles.

An outer peripheral portion of the engine 5 is covered with a bonnet 13 and a side cover 14, and the steering handle 9 is disposed above a rear portion of the bonnet 13. A seat take-out frame 16 with a seat 15 is disposed above the left and right rear wheels 4, 4, and a main frame 3, 3 and a rear main frame 3a are provided in a space between the seat take-out frame 16 and the side cover 14. , 3a are provided so as to approach and cover each other.

Next, the power transmission system will be described. The engine 5 has a crankshaft arranged in the front-rear direction, and a drive pulley 18 is attached to a front part of the engine 5 with a take-out shaft protruding forward. A first transmission shaft 19 is provided below the engine 5 in parallel with the crankshaft, and a driven pulley 20 is attached to a front end of the first transmission shaft 19. A rotation transmission tool 21 such as a belt is wound between the driving pulley 18 and the driven pulley 20 to transmit power, and power is transmitted from the rear end of the first transmission shaft 19 to the first transmission case 22, thereby transmitting the first transmission. The power is transmitted from the lower part of the case 22 to the main clutch 23a via the transmission shaft.
a to the second transmission case 23. Further, the first PTO shaft 28 projects rearward from the upper portion of the first transmission case 22, and power is transmitted from the first PTO shaft 28 to the chemical spray pump 29 via the universal joint for work equipment.

As shown in FIG. 3, various gear groups are provided in the second transmission case 23. The transmitted power is sub-shifted by a sub-transmission gear group 24, and further transmitted by a main transmission gear group 25. The transmission is transmitted to the traveling output shaft 26 at the lower portion of the second transmission case 23 and transmitted to the left and right front wheels 8, 8 and the left and right rear wheels 4, 4 having the same diameter. Further, the power transmitted from the main clutch 23a to the input shaft 27 is not shifted and the second transmission case 2
The second PTO that is suspended from the upper rear side of 3 toward the rear
Power is transmitted to the shaft 30, and power is transmitted from the second PTO shaft 30 to the working machine via a working machine universal joint (not shown).

Next, a description will be given of a mounting structure of the two-point links 32, 32 for supporting the hitch 31 so as to be able to move up and down.
Mounting seats 33 on the front side of the rear axle case 11
As shown in FIG. 4, the fulcrum brackets 34, 34 are detachably attached at intervals in the left-right direction. The front end portions of the two-point links 32, 32 having an L-shape in side view are connected to the fulcrum brackets 34, 34 by pins so as to be vertically rotatable. The front end of the lift cylinder 35 is connected to the rear main frame 3a by a pin, and the rear end of the link cylinder 35 is connected to the bending portion of the two-point link 32, 32 by a pin. , 32 are vertically rotated to raise and lower the hitch 31. Various work machines are attached to the hitch 31.

There are some types in which the control spraying device is mounted on the tractor, which does not require the two-point links 32, 32. In such a type, the mounting seats 33, 33 are provided.
Fulcrum brackets 34, 34 and two-point links 32, 3
2 to reduce weight. In the conventional device, the fulcrum brackets 34, 34 are integrally formed with the rear axle case 11, and therefore, in the case of the type equipped with a control spray device, the fulcrum brackets 34, 34 cannot be removed. However, with the above configuration, the fulcrum bracket 34,
34 can be removed, and the weight of the control spray device mounted type can be reduced.

Next, another embodiment of the connection structure between the lift cylinder 35 and the two-point links 32 will be described with reference to FIG. A connecting member 36 is connected between the bent portions of the left and right two-point links 32, 32 by, for example, welding.
In FIG. 6, mounting portions 37, 37 projecting to the front side are configured to increase strength. An operating point pin 39 is inserted into the connecting holes 38a, 38a of the bending portions of the two-point links 32, 32 and the connecting holes 38b, 38b of the mounting portions 37, 37. The part is pin-connected.

The connecting member 36 connecting the bending portions of the left and right two-point links 32, 32 has a mounting portion 37 protruding to the front side having connecting holes 38b, 38b for connecting the lift cylinders. , 37, the strength of the two-point links 32, 32 can be increased.

As shown in Japanese Unexamined Patent Publication No. 4-169102, the conventional device has a structure in which the left and right two-point links are respectively extended and retracted by the left and right lift cylinders.
There was a problem that the two-point link was twisted in the horizontal direction, resulting in poor durability. However, by configuring as described above, the connecting body 36 between the left and right two-point links 32, 32 is connected.
The connection portions 38a, 38a for connecting the lift cylinders are formed in the mounting portions 37, 37 which are configured to protrude to the front side from the connection body 36 so that the left and right two-point links 32, 32 are connected. By connecting the lift cylinder 35 by inserting the operating point pin 39 into the connecting holes 38a, 38a of the bending portions of the connecting member 38 and the connecting holes 38b, 38b of the attaching portions 37, 37 of the connecting body 36, the left / right two-point link 32 is formed. , 32 can be strengthened against twisting in the horizontal direction.
Two-point links 32, 32 are provided by a single lift cylinder 35.
Is configured to move up and down via the operating point pin 39,
Cost can be reduced.

Next, the mounting configuration of the tractor vehicle speed sensor 40 will be described with reference to FIG. The motive power transmitted to the second transmission case 23 is sub-shifted by the sub-transmission gear group 24, and then is shifted forward and backward or at high and low speeds by the main transmission gear group 25, and the traveling transmission shaft at the lower portion of the second transmission case 23. 41. Second mission case 23
The traveling output shaft 26 is supported at the lowermost end of the traveling gear 42 of the traveling transmission shaft 41 and the traveling second shaft of the traveling output shaft 26.
It is transmitted to the traveling output shaft 26 by the engagement of the gear 43,
From the front side of the traveling output shaft 26 via the front wheel transmission shaft 44
The power is transmitted to the right front wheels 8, 8 and transmitted from the rear side of the traveling output shaft 26 to the left and right rear wheels 4, 4 having the same diameter as the front wheels via the rear wheel transmission shaft 45. A vehicle speed detection gear 46 is attached to the rear end of the traveling transmission shaft 41, and a vehicle speed sensor 40 is attached to the outer periphery of the vehicle speed detection gear 46 to detect the vehicle speed of the tractor.

The tractor has, for example, a diameter of 690 mm,
There are four types of tires, 800 mm, 900 mm, and 940 mm.
6, the power is reduced and transmitted by the traveling gear 42 and the traveling second gear 43 each having a predetermined number of teeth, respectively.
The auxiliary transmission gear group 24 and the main transmission gear group 25 in the second transmission case 23 are shifted to a speed corresponding to the diameter of the mounted tire, and, for example, a pest control operation is performed.

At this time, a set of running gears 42 having a predetermined number of teeth is provided.
When the vehicle speed is detected by detecting the rotation of the vehicle speed detection gear 46 of the traveling transmission shaft 41 and the vehicle speed is detected by the rotation of the vehicle speed detection gear 46 of the traveling transmission shaft 41, the tire mounted even when the traveling transmission shaft 41 is rotating at a predetermined speed The vehicle speed changes depending on the diameter, and it is necessary to change the vehicle speed according to the diameter of the tire on which the vehicle speed detection program is mounted, which makes the program management complicated.

Therefore, in this embodiment, even if the tire diameter is changed to various ones, the vehicle speed can be detected by the same program to solve the above-mentioned problem. In this embodiment, the reduction ratio between the traveling gear 42 for transmitting power from the traveling transmission shaft 41 to the traveling output shaft 26 and the second traveling gear 43 is changed in accordance with the diameter of the tire to be mounted, and is changed in accordance with the tire diameter. The running gear 42 and the running second gear 43 having the reduction ratio are prepared by the number of types of tires, and the running gear 42 and the running second gear 43 are changed according to the tire diameter, and the running transmission shaft 41 rotates by a predetermined number. In such a case, the vehicle travels at the same vehicle speed regardless of the tire diameter.

Thus, irrespective of the four types of tire diameters, the vehicle speed of the tractor corresponds to the rotation of the vehicle speed detecting gear 46 of the traveling transmission shaft 41, and the vehicle speed can be accurately detected by the same program. Thus, for example, even when controlling the spray amount of the control spray device, the control spray amount per predetermined area can be made appropriate.

Next, the forward / reverse transmission configuration of the second PTO shaft 30 will be described with reference to FIG. 2nd mission case 2
3, the second PTO shaft 30 is protruded from the rear side to take out the power for the working machine, and the forward working power and the reverse working power are taken out from the second PTO shaft 30 via the working machine transmission case 47, In order to enable the forward and reverse driving of the motor.

The work machine transmission case 47 is provided with a hollow work first transmission shaft 48 at the lower portion and a work second transmission shaft 49 at the upper portion, and the work first transmission shaft 48 and the work Between the transmission shaft 49, a forward transmission path 50 including sprockets 50a and 50b and a transmission chain 50c, and gears 53a and 5
A reverse rotation transmission path 53 composed of 3b is provided.

The first PTO shaft 48 has a second PTO
With the shaft 30 inserted, the work implement transmission case 47 is attached to the second transmission case 23. And the second PT
When the clutch 54 is movably mounted in the spline groove of the O-shaft 30 and the clutch 54 is moved to the left, the clutch 54
The pawl of the sprocket 50a is engaged with the pawl of the sprocket 50a, and the power is transmitted through the forward rotation transmission path 50. When the clutch 54 is moved to the right, the pawl of the clutch 54 and the pawl of the gear 53a are engaged. Power is transmitted by the reverse rotation transmission path 53.

The working machine transmission case 47 provided with the normal rotation transmission path 50 and the reverse rotation transmission path 53 is
By attaching to the transmission case 23 and linking to the second PTO shaft 30, the reverse PTO shaft can be attached later.

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is an overall plan view.

FIG. 3 is a cut-away side view of a main part.

FIG. 4 is a perspective view of a main part.

FIG. 5 is a perspective view of a main part.

FIG. 6 is a cut-away side view of a main part.

[Explanation of symbols]

 Reference Signs List 1 moving vehicle 3 main frame 11 rear axle case 31 hitch 32 two-point link 33 mounting seat 34 fulcrum bracket 35 lift cylinder 36 connecting body 37 mounting part 38a, 38a connecting hole 39 operating point pin

Claims (1)

[Claims] 1. A front end portion of left and right two-point links 32, 32, which are bent in an L-shape when viewed from the side, are connected to the body of a moving vehicle 1 by pins so as to be vertically rotatable. Point link 3
The hitch 31 is connected to the rear ends of the left and right two-point links 32, 32, and the bent portions of the left and right two-point links 32, 32 are connected to each other by a connecting body 36. The connecting body 36 projects forward and has connection holes 38a,
The connecting holes 38 of the bending portions of the left and right two-point links 32, 32 constitute the mounting portions 37, 37 provided with 38a.
a, 38a and the connecting holes 38b of the mounting portions 37, 37,
One end of the lift cylinder 35 is pin-connected by an operating point pin 39 inserted through the lift cylinder 35b.
A hitch elevating device for a mobile vehicle, wherein the other end of the hitch is connected to the body by a pin.